Western Signal Whistler Series

The Whistler was a supercharged electromechanical siren produced by Western Signal. The Whistler initially came in three port ratios, 5 Port single tone, or 4/5, and 5/6 Port dual tone. This siren was patented in the late 40s as a cold war siren and was meant to become Federal Signal's Thunderbolt siren series. However starting 1962, it was also available with a new set of port ratios which were, 8/10, 8/12, 9/12, and 10/12 dual tone; it was also available in single tone port configurations of 8, 10, 9, 6, 5, 7, and 12 port. This siren went through many changes throughout it's life, but was outsold by Federal's Thunderbolt, the siren it inspired. Two known models were produced. First came the Whistler 110, which was a model that almost closely resembled Federal's Thunderbolt siren. Later on, Western Signal opted to change the design of the Whistler 115 to make it stand out from the Thunderbolt and avoid potential lawsuits over the two similar designs despite being the inspiration for the thunderbolt. Aside from that, they decided to correct some design flaws that were discovered in the original model. These changes to the design include, pole mounted vertical blower, controller removed from blower assembly and housed in it's own cabinet, and most notably, the projector supports were removed.